Clock



FIG. 1 is a front perspective view of a clock showing a preferred embodiment of our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear perspective view thereof, showing the support arms in an extended orientation.

The broken line showings of controls are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a clock, as shown and described. 